| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.69/5 | 4.27/5 |
| Vol 3-4 | 2.97/5 | 4.48/5 |
| Vol 5-6 | 2.73/5 | 4.35/5 |
| Vol 7-8 | 2.85/5 | 4.47/5 |
| Vol 9-10 | 3.13/5 | 4.44/5 |
| Vol 11-12 | 3.47/5 | 4.50/5 |
| Vol 13-14 | 3.73/5 | 4.54/5 |
| Vol 15-16 | 3.34/5 | 4.51/5 |
| Vol 17-18 | 3.18/5 | 4.50/5 |
| Vol 19-20 | 2.93/5 | 4.44/5 |
| Vol 21-22 | 3.33/5 | 4.53/5 |
| Vol 23-24 | 2.92/5 | 4.42/5 |
| Vol 25-26 | 3.19/5 | 4.50/5 |
| Overall | 3.12/5 | 4.54/5 |